Ryanair and Scandinavian Airlines flights were among those targeted. Artur Widak/NurPhoto via Getty Images

Four flights in Europe were targeted by bomb threats on Tuesday.

They included two flying to Poland, one landing in Spain, and another in Bulgaria. One of them was diverted, while the other airplanes reached their destinations before being checked for explosives.

Here's what we know:

Flight impacted: Scandinavian Airlines Flight 751 out of Copenhagen

Scandinavian Airlines Flight 751 left Copenhagen around 8:30 a.m. for Warsaw on Tuesday. It landed as expected an hour later without diversion.…